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Simplifying 3(4x + 7) = 3x + 9 Reorder the terms: 3(7 + 4x) = 3x + 9 (7 * 3 + 4x * 3) = 3x + 9 (21 + 12x) = 3x + 9 Reorder the terms: 21 + 12x = 9 + 3x Solving 21 + 12x = 9 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 21 + 12x + -3x = 9 + 3x + -3x Combine like terms: 12x + -3x = 9x 21 + 9x = 9 + 3x + -3x Combine like terms: 3x + -3x = 0 21 + 9x = 9 + 0 21 + 9x = 9 Add '-21' to each side of the equation. 21 + -21 + 9x = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 9x = 9 + -21 9x = 9 + -21 Combine like terms: 9 + -21 = -12 9x = -12 Divide each side by '9'. x = -1.333333333 Simplifying x = -1.333333333
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